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| Titel |
Observational study of influence of aerosol hygroscopic growth on scattering coefficient over rural area near Beijing mega-city |
| VerfasserIn |
X. L. Pan, P. Yan, J. Tang, J. Z. Ma, Z. F. Wang, A. Gbaguidi, Y. L. Sun |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 19 ; Nr. 9, no. 19 (2009-10-09), S.7519-7530 |
| Datensatznummer |
250007676
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| Publikation (Nr.) |
 copernicus.org/acp-9-7519-2009.pdf |
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| Zusammenfassung |
| We investigated aerosol hygroscopic growth property and its influence on
scattering coefficient using M9003 nephelometers in coupling with humidity
controlled inlet system at a rural site near Beijing mega-city from 24 April
to 15 May 2006. Inlet relative humidity was controlled in an increasing range
of 40%–90% while aerosol hygroscopic growth factor of scattering
coefficient, f(RH=80%) as ratio of scattering coefficient at RH=80%
to "dry" scattering coefficient (RH<40%) varied in a range of
1.07–2.35 during the measurement. Further analysis indicated that under dust
episode, measured f(RH=80%) is 1.2±0.02, and estimated periodic
mean value of f(RH=80%) was 1.31±0.03 under clean periods; during
urban pollution periods, the aerosol displayed relative strong water
absorbing properties with f(RH=80%) of about 1.57±0.02. An
examination of chemical composition of daily filter samples highlighted that
aerosol hygroscopicity was generally depressed with the increasing ratio of
organic matter (OMC)/ammonium sulfate (AS) in particle mass, similar with the
results of many previous studies. However, a special case with high value of
f(RH=80%)=2.21 and high OMC/AS ratio was also observed, this exception
reflected physico-chemical particularities of organic matter and its complex
interaction with other compounds during this episode. |
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